CN103581341A - Distributed mobile data transmission method for CCN (Content-Centric Networking) - Google Patents
Distributed mobile data transmission method for CCN (Content-Centric Networking) Download PDFInfo
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Abstract
The invention discloses a distributed mobile data transmission method for CCN (Content-Centric Networking). The method includes the following steps: 1) when moving from an access router AR1 to the overlapping area of the AR1 and a router AR2, a receiver sends a message HI containing the identification information of the AR2 to the AR1; 2) when receiving the HI, the AR1 searches the content name corresponding to the receiver in a request table PIT (Pending Interest Table), builds a signaling message by using the content name and the identification of the AR2, and deletes the corresponding PIT entry; 3) the AR1 sends the signaling message along a reverse path corresponding to the content name, and identifies a branch node; the branch node directs the corresponding entry in the PIT to the AR2 and continues to forward the signaling message, and a subsequent router builds a PIT entry corresponding to the content name and directs a next-hop interface to the AR2; 4) an intermediate router between the branch node and the AR2 builds a PIT entry corresponding to the content name. The invention avoids handoff delay and enormous network expenses.
Description
Technical field
The invention discloses a kind of data transmission method, relate in particular to the distributed mobility data transmission method of a kind of CCN, belong to mobile communication technology field.
Background technology
Along with the develop rapidly of information technology, new internet, applications emerges in an endless stream, and causes Traditional IP technology to face numerous challenges.Particularly the emerging market demand such as the develop rapidly of mobile communication technology and Internet of Things and cloud computing emerges in large numbers, changing gradually the traditional mode that Internet user obtains Service Source, make the Internet progressively from the basic function interconnecting to supporting the mutual development of demand of mass data, and network security, efficiently mobile etc. is all proposed to new challenge.
In recent years, researcher has used a lot of ways and meanses to improve and has optimized existing the Internet, make that it is supported more on a large scale, more high efficiency data resource obtains, as built increasing data center aspect Internet architecture, in transportation level, use more and more widely the technology of the optimizing datas such as P2P, the mode of these but " patch installing " makes more and more redundancy of conventional internet architecture, and function becomes increasingly complex.For this reason, Chinese scholars has been carried out many research that future network framework is redesigned, and has been risen to national strategy height, is intended to fundamentally consider to solve the problem that current internet supports efficient data transmission.Future network system centered by information (Information Centric Networking, ICN), the address that replaces main frame by the content with sign, realize the new network framework of content-based name addressing and route, obtained paying close attention to widely, wherein " content center network " (Content-Centric Networking, CCN) is the scheme that wherein the most typically represents.Compare with traditional approach, the addressing route of the content-based name of CCN is devoted to change existing network communication mode, from paying close attention to " resource where ", change " what resource is " into, from the forwarding realizing based on end address, change the forwarding based on resource name into, thereby can solve to a certain extent the problems such as route extensibility, Data dissemination efficiency.
CCN passes through to the direct name of content and the addressing support based on this name the buffer memory to content itself, and has guaranteed the efficiency to huge volumes of content addressing by full distributed hop-by-hop addressing system, and its basic communication pattern as shown in Figure 1.
The request of some content (Interest) is sent to a router, router is safeguarded the Interest table (PIT of a wait, Pending Interest Table), in this table, safeguarded that receiving Interest does not still also receive the content information of corresponding data bag, CCN router just can repeatedly not send Interest like this, thereby plays polymerization to a certain extent.In PIT, also comprise request interface corresponding to certain content name, thereby can after receiving corresponding data, transfer back to the interface of request.In addition, the packet that content caching (CS, Content Store) receives for buffer memory, when have the request of this content next time again, router can directly be responded by the data in CS.Forwarding information table (Forwarding Information Base, FIB) is similar to the routing table in IP network, indicates certain content to go for and to ask from which interface.
Be accompanied by the quickening of social life rhythm, the development of mobile communication is also changing interpersonal communication way.Therefore, along with 3G (Third Generation) Moblie technology is in Chinese deployment and development, the concept of mobile Internet is rooted in the hearts of the people, and becomes the development center of gravity of Future Information communication industry.And mobility support technology is to support one of of paramount importance technology of mobile Internet.
Although in CCN, the strong dependence for the IP address of identification nodes positional information has been broken away from the route of content and addressing, route relies on content name hop-by-hop to set up, after receiving node moves to new position, can continue communication process by resending content request message, but how effectively utilizing the intrinsic caching mechanism of CCN, to realize that receiving node switches be fast a good problem to study (list of references: B.Ahlgren, et al., A Survey of Information-Centric Networking (Draft), in Proceedings of Information-Centric Networking Seminar, February2011).Current main Research Thinking is divided into two classes:
1) location management based on centralized: as the people such as Do-hyung Kim are divided into real-time traffic and non-real-time traffic by the type of service of CCN, and it is machine-processed to propose pointedly recipient's handover management, its core concept is in network, to dispose the aggregation node of memory node positional information (Rendezvous point) (list of references: D.Kim, et al., Mobility Support in Content Centric Networks, in Proceedings of the ICN workshop on Information-centric networking, Helsinki, Finland, August2012.).But still there is poor expandability in this scheme, and the problem of compatible CCN decentralization feature well;
2) agent way based on Access Network: as the people such as J.Lee and D.Kim propose the mobility management mechanism (list of references: J.Lee based on agency, D.kim, M-W.Jang, and B-J.Lee, Proxy-based Mobility Management Scheme in Mobile Content Centric Networking (CCN) environments, in Proceedings of29th International Conference on Consumer Electronics (ICCE), Las Vegas, USA, January2011; J.Lee, and D.Kim, Proxy-assisted Content Sharing Using Content Centric Networking (CCN) for Resource-limited Mobile Consumer Devices, IEEE Transactions on Consumer Electronics, 57 (2): 477-483, June 2011.; Soon Y.Oh, Davide Lau, and Mario Gerla, Content Centric Networking in Tactical and Emergency MANETs, in Proceedings of the3rd IFIP, Venice, Italy, October2010.; ), to solve the data-bag lost problem in recipient's moving process.But this mechanism is not utilized the intrinsic cache resources of CCN well, thereby supports efficient recipient to move.
In addition, content publisher may be also the equipment of a movement.Sape Mullender has analyzed the problem that in CCN, move in source: not only face huge routing convergence problem, and may move the difficulty (reference: http://www.ccnx.org/pipermail/ccnx-users/attachments/20110919/7 1193aec/) that causes content verification due to source node.Current solution is mainly divided into two classes:
1) mode based on tunnel: as Jihoon Lee has analyzed the problem that in CCN, source node moves, and the source mobility solution (reference: J.Lee that forwards based on tunnel proposed, S.Cho and D.Kim, Device Mobility Management in Content-Centric Networking, IEEE Communications Magazine, 50 (12): 28-34, December2012.).But the mode based on tunnel can be introduced huge overhead in mass data is mutual;
2) routing mechanism based on there being state: as Dookyoon Han etc. has proposed PMC(Publisher Mobility in CCN), in the transmitting of router, set up two kinds of entries: stablize entry and dynamic environment, dynamic environment is wherein for the new location information after storing source node and moving, thereby can guarantee that source node moves redirection of router (list of references: D.Han afterwards, M.Lee, K.Cho, Ted " Taekyoung " Kwon, and Y.Choi, PMC:Publisher Mobility Support for Mobile Broadcasting in Content Centric Networks, in Proceedings of AsiaFI2012summer school, Kyoto, Japan, August2012.).The people such as F.Hermans also propose the source node mobility support scheme (F.Hermans of similar thinking, E.Ngai, and P.Gunningberg, Mobile Sources in an Information-Centric Network with Hierarchical Names:An Indirection Approach, in Proceedings of the7th Swedish National Computer Networking Workshop
june2011.).But this class solution causes larger state-maintenance burden to core net router, can have a strong impact on the efficiency of data retransmission in CCN environment.
The present invention is based on CCN communication mechanism, propose a kind of full distributed mobility management protocol, not only support recipient's quick switching, and can significantly reduce source node under some point-to-point communication scene and move the protocol overhead causing.
Summary of the invention
For the technical problem existing in prior art, the object of the present invention is to provide the distributed mobility data transmission method of a kind of CCN.In the CCN agreement basic, if a receiving node moves, can on old data transmission link, leave over so lower a large amount of PIT information that may be useless, deleted if these PIT information do not have, still will be used to return data.But because mobile node has been switched to new position, so thereby do not receive these data waste resources at all.On the other hand, mobile node is switched to behind new position, and triggering that can only be by initiatively or passive overtime the resending of Interest of carrying out, set up the PIT entry on new path, obviously causes larger handover delay.
For publisher node, current CCN does not distinguish the type of service (as the business of broadcast-type or point-to-point business) that this publisher participates in, only by the position new re-start prefix notice to upgrade network in the FIB entry of router, thereby can continue to receive the Interest of its data of request.Although for the business of broadcast-type (if publisher is a video source), such mode can guarantee can make this publisher receive the Interest of request msg any time.But for point-to-point business (as voice or video conversation), such blindness floods and can cause huge network overhead, and time delay is long, have a strong impact on user and experience.
Technical scheme of the present invention is:
A distributed mobility data transmission method, wherein mobile person is recipient, the steps include:
1), when recipient moves to the overlapping region of AR1 and another couple in router AR2 from current couple in router AR1, this recipient sends a switching initialization message HI who comprises this AR2 identification information to this AR1;
2), when this AR1 receives this HI message, from the request list PIT of oneself, search content name corresponding to this recipient, and construct a signaling message by the sign of this content name and this AR2; The content name that described signaling message comprises target couple in router, switches corresponding recipient, needs intermediate router to process; And this AR1 deletes request table (PIT) entry corresponding to this recipient;
3) this AR1 sends this signaling message along the inverse path of forwarding information table FIB corresponding to this content name, in the forwarding information table FIB of intermediate router judgement oneself, whether publisher's interface and the interface of this AR2 of this content name is identical, if identical, this intermediate router is deleted request table (PIT) entry corresponding to this recipient and is continued to forward this signaling message; If different, this intermediate router is the branch node that switch in this recipient path, and request table (PIT) entry corresponding to this recipient in own request list PIT pointed to this AR2 and continued to forward this signaling message, successive router is set up PIT entry corresponding to this content name, and next-hop interface is pointed to target couple in router AR2;
4) intermediate router from this branch node to this AR2 is set up PIT entry corresponding to this content name, for receiving corresponding data and sending it to this recipient who enters this AR2.
Further, adopt the stratification naming mechanism of CCN to set up this signaling message.
Further, the name format of this signaling message is :/AR/handover-receiver/content; Wherein, AR is target couple in router, and handover-receiver represents that this message is the handoff procedure for certain recipient, and content is the name that needs the content of intermediate router processing.
Further, be provided with the flag bit of a 1bit in this signaling message, when certain intermediate router is defined as after described branch node, this flag bit is set to 1; Described intermediate router detects the flag bit in this signaling message, if its value is 1, no longer carries out the contrast of interface, directly sets up PIT entry corresponding to this content name, and next-hop interface is pointed to target couple in router AR2.
Further, comprise a timer in this signaling message, the intermediate router in this inverse path, after receiving this signaling message, is tied to this timer by the FIB of adjustment or PIT state; If this timer expiry, but when this intermediate router is not received data that this content name is corresponding or this content name corresponding requests, the FIB of this adjustment or PIT state are deleted.
A distributed mobility data transmission method, wherein mobile person is publisher, the steps include:
1) publisher from current couple in router AR1 move to AR1 and another couple in router AR2 overlapping region time, this recipient sends a switching initialization message HI who comprises this AR2 identification information to this couple in router AR1;
2), when this AR1 receives this HI message, from the request list PIT of oneself, search content name corresponding to this publisher, and construct a signaling message by the sign of this content name and this AR2; The content name that described signaling message comprises target couple in router, switches corresponding publisher, needs intermediate router to process; And this AR1 deletes forwarding information table FIB corresponding to this content name;
3) this AR1 sends this signaling message along the inverse path of request list PIT entry corresponding to this content name, in the forwarding information table FIB of intermediate router judgement oneself, whether the interface of request list PIT entry corresponding to the interface of AR2 and this content name is identical, if identical, this intermediate router is deleted forwarding information table FIB corresponding to this content name, and continues to forward this signaling message; If different, this intermediate router is the branch node that switch in this publisher path, and forwarding information required list corresponding to this content name in own Forward-reques information table FIB pointed to this AR2, then PIT replicate entries corresponding to this content name forwarded to this signaling message to this signaling message continuation;
4) intermediate router from this branch node to this AR2 is set up PIT entry corresponding to this content name and FIB entry, for receiving corresponding data and request, and sends the data to corresponding recipient, request is sent to this publisher who enters this AR2.
Further, adopt the stratification naming mechanism of CCN to set up this signaling message.
Further, the name format of this signaling message is :/AR/handover-publisher/content; Wherein, AR is target couple in router, and handover-publisher represents that this message is the handoff procedure for certain issue, and content is the name that needs the content of intermediate router processing.
Further, be provided with the flag bit of a 1bit in this signaling message, when certain intermediate router is defined as after described branch node, this flag bit is set to 1; Described intermediate router detects the flag bit in this signaling message, if its value is 1, no longer carries out the contrast of interface, directly sets up PIT entry corresponding to this content name, and next-hop interface is pointed to target couple in router AR2.
Further, comprise a timer in this signaling message, the intermediate router in this inverse path, after receiving this signaling message, is tied to this timer by the FIB of adjustment or PIT state; If this timer expiry, but this intermediate router is not while receiving data that this content name is corresponding or request corresponding to this content name, the FIB of this adjustment or PIT state deleted.
Compared with prior art, good effect of the present invention is:
1) by the stratification naming mechanism of CCN, can identify couple in router;
2) a kind of new signaling message is proposed, for finding that mobile node moves the branch node in the path after front and movement; Overcome the huge network overhead that cause existing mobile update position.
3) mobile node triggered handoff procedure before movement, and adjusted the routing state on path by this signaling message, thereby can continue as early as possible to receive data after recipient is switched, and publisher can continue to receive the Interest of its data of request as early as possible.
Accompanying drawing explanation
Fig. 1 is CCN basic communication pattern;
Fig. 2 is mobility data transmission method flow chart of the present invention;
Fig. 3 is recipient's switching flow figure;
Fig. 4 is publisher's switching flow figure;
Fig. 5 moves exemplary plot for recipient;
Fig. 6 moves exemplary plot for publisher.
Embodiment
1) switching architecture based on branch node
As shown in Figure 2, this framework adopts distributed mechanism to CCN mobility transmission architecture proposed by the invention, so do not introduce the centralized server of any agent node and specific function.But carrying out hop-by-hop, basic routing mechanism by CCN revises the routing state of old path (data transfer path before switching) and the upper router of new route (data transfer path after switching).
For recipient moves, need to be at branch node (Branching Node, BN) on router before, delete the PIT entry of corresponding content, and on router after branch node, set up the PIT entry of corresponding content, and by Face(, be the interface of the down hop that in CCN, FIB/PIT describes) point to new AR.After so just having guaranteed that mobile reception person switches, data are no longer continued to receive in old path, and the data that recipient wants can send to target location by new path as early as possible.
For publisher, need on the router of branch node, delete the FIB entry of corresponding content, and set up the FIB entry of corresponding content on router after branch node, and Face is pointed to new AR, and set up corresponding PIT entry.After so just having guaranteed that publisher switches, Interest is no longer continued to receive in old path, and publisher can continue receive Interest and send data from new position as soon as possible.
2) signaling message of expansion
For the triggering shifting to an earlier date, switch the routing state on also synchronous old path, the present invention proposes a new signaling message, is referred to as Control message.This Control message can have and the similar structure of Interest (can distinguish by a flag bit and Interest, the present invention will not limit its implementation), and its name format comprising is as follows:
/AR/handover-receiver/content
First's sign target couple in router (Access Router, AR), second portion represents that this message is the handoff procedure for certain recipient, last part is the name that needs the content of intermediate router processing.In addition, in this message, need to have the flag bit of a 1-bit, for identifying the branch node that whether has found old path and new route.
Similarly, in order to trigger publisher's switching and to carry out the synchronous of routing state, also adopt similar message, but its name format is
/AR/handover-publisher/content
First's sign target couple in router (Access Router, AR), second portion represents that this message is the handoff procedure for certain publisher, last part is the name that needs the content of intermediate router processing.In addition, in this message, also adopt the flag bit of a 1-bit, for identifying the branch node that whether has found old path and new route.
3) recipient moves
The flow process that recipient moves as shown in Figure 3.This Control message is along the inverse path transmission of this content delivery, middle router is after receiving this message, recognize that this is a process that recipient moves, therefore will compare the FIB entry in corresponding content source and the FIB entry of destination router, if (when received control message as N3, the FIB of content source points to BN node to these two entry differences; And destination router, i.e. new AR, FIB point to BN, so N3 just thinks own Bu Shi branch.On the contrary, when BN receives, the FIB of content points to N2, and the FIB of new AR points to N5, just thinks it oneself is branch.), illustrate that this router is exactly the branch node in new He Jiu path, path, then this router upgrades the PIT entry of this content, and corresponding Face(is the interface of the down hop that in CCN, FIB/PIT describes) be target couple in router, and corresponding content is sent to new couple in router.In addition, this router need to be 1 by the 1-bit mark position in Control message, represents to have selected branch node.Like this, while continuing to forward this message, branch node will no longer carry out the contrast of Face to the router between the AR2 of new on-position (destination being switched to), but directly sets up the PIT entry of this content, and Face is pointed to target couple in router AR2.
4) publisher moves
The flow process that publisher moves as shown in Figure 4.Control message is along the transmission of Interest transmission inverse path, each middle router needs the FIB entry of comparison object couple in router and the PIT entry of this content, if Face is different, illustrate that this router is the branch node of old data transfer path and new data transfer path.Then this router configuration FIB entry, is mapped to new couple in router by the name extracting from Control, and corresponding Interest message is sent to this interface.In addition, it is 1 that branch node also needs the 1-bit mark position in Control, and PIT corresponding to this content copied in Control message.And router subsequently only needs according to Control structure FIB entry and PIT entry and forwards Interest message.
5) mistake is processed
In order to trigger in advance the experience of switching and improving mobile subscriber, the mobility management mechanism that this patent is carried has adopted the thought of quick switching, by terminal, the information of target couple in router is informed to current couple in router in advance.This switching based on prediction is obviously with certain mistake possibility (mobile node does not move to the target couple in router of prediction).In actual conditions, this switching based on prediction is divided into two stages: mobile node disconnects the connection of current access network, and mobile node is connected to new objective network.Obviously, in the handoff procedure based on prediction, first process is bound to occur in general, and main problem is present in the uncertainty of second stage.In order to process error prediction, this patent proposes Control signaling in practical operation need to comprise a timer, receives so all intermediate routers of this message, all the FIB of adjustment or PIT state is tied to this timer.If this timer expiry, but router still do not receive corresponding content (content that recipient is asking) or to should content request Interest time, thereby just think that wrong prediction has occurred deletes this state.So next, mobile node will inevitably adopt basic CCN mechanism to resend Interest or content notice in new on-position.
Example
In order more clearly to show switching flow that this patent is carried, this part is illustrated respectively recipient being moved to the process moving with publisher.
1) recipient moves
In this example, mobile reception person is switched to AR2 from AR1, as shown in Figure 5.
Main flow process comprises:
1), when mobile reception person moves to the overlapping region of AR1 and AR2, predict possible switching;
2) in order to trigger mobile management, mobile reception person sends switching initialization message (Handover Initiation to AR1, HI), this message can be used for reference IPv6 completely and switches fast (list of references: R.Koodli, Mobile IPv6Fast Handovers, IETF RFC5268, June2008) in triggering message, but the identification information that comprises AR2;
3) when AR1 receives HI message, thereby need the PIT that checks oneself to find out content name corresponding to this recipient, and construct the name in Control message by the sign of this content name and AR2.In addition, AR1 is by deleting corresponding PIT entry (the request entry that PIT table comprises corresponding a plurality of contents, each entry comprises asked content, receives the interface of request, and the interface that sends of request), because this recipient is about to leave.Along the inverse path of the FIB of this content, AR1 forwards Control message.Intermediate router judges that in own FIB, whether the publisher's of this content interface is identical with the interface of AR2, if identical, this router will be deleted the PIT of corresponding content as AR1, and continues this Control message of inverse path forwarded hop-by-hop along content delivery.
4) if different, this router oneself is the branch node that switches path, front and back by thinking, thereby adjusts the PIT entry sensing AR2 of corresponding content.In addition, this router is also set to 1 the 1-bit flag bit in Control, represents to have selected branch node.
5) so the successive router from branch node to AR2 by only setting up PIT entry corresponding to this content, for the content that is about to receive is prepared.After mobile reception person moves to AR2, just can receive immediately that content of expectation like this.
2) publisher moves
In this example, mobile publisher is switched to AR2 from AR1, as shown in Figure 6.
Main flow process comprises:
1), when mobile publisher moves to the overlapping region of AR1 and AR2, predict possible switching;
2) in order to trigger mobile management, mobile publisher sends switching initialization message (Handover Initiation to AR1, HI), this message can be used for reference IPv6 completely and switches fast (list of references: R.Koodli, Mobile IPv6Fast Handovers, IETF RFC5268, June2008) in triggering message, but the identification information that comprises AR2;
3) when AR1 receives HI message, thereby need the FIB that checks oneself to find out content name corresponding to this publisher, and construct the name in Control message by the sign of this content name and AR2.In addition, AR1 will delete corresponding FIB, because this publisher is about to leave.Along the inverse path of the PIT of this content, AR1 forwards Control message.Intermediate router judges that whether the interface of AR2 in own FIB is identical with the PIT entry corresponding interface of this content, if identical, this router will be deleted the FIB of corresponding content as AR1, and continues this Control message of forwarded hop-by-hop along the inverse path of the PIT entry of this content.
4) if different, this router oneself is the branch node that switches path, front and back by thinking, thereby adjusts the FIB sensing AR2 of corresponding content.In addition, this router is also set to 1 the 1-bit flag bit in Control, represent to have selected branch node, and by the PIT replicate entries of corresponding content in Control message.
5) successive router from branch node to AR2 will only be set up PIT entry corresponding to this content and FIB entry so, for content and the Interest that is about to receive prepares.After mobile publisher moves to AR2, just can receive immediately corresponding Interest energy forwarding immediately data like this.
Claims (10)
1. a distributed mobility data transmission method of CCN, wherein mobile person is recipient, the steps include:
1), when recipient moves to the overlapping region of AR1 and another couple in router AR2 from current couple in router AR1, this recipient sends a switching initialization message HI who comprises this AR2 identification information to this AR1;
2), when this AR1 receives this HI message, from the request list PIT of oneself, search content name corresponding to this recipient, and construct a signaling message by the sign of this content name and this AR2; The content name that described signaling message comprises target couple in router, switches corresponding recipient, needs intermediate router to process; And this AR1 deletes request table (PIT) entry corresponding to this recipient;
3) this AR1 sends this signaling message along the inverse path of forwarding information table FIB corresponding to this content name, in the forwarding information table FIB of intermediate router judgement oneself, whether publisher's interface and the interface of this AR2 of this content name is identical, if identical, this intermediate router is deleted request table (PIT) entry corresponding to this recipient and is continued to forward this signaling message; If different, this intermediate router is the branch node that switch in this recipient path, and request table (PIT) entry corresponding to this recipient in own request list PIT pointed to this AR2 and continued to forward this signaling message, successive router is set up PIT entry corresponding to this content name, and next-hop interface is pointed to target couple in router AR2;
4) intermediate router from this branch node to this AR2 is set up PIT entry corresponding to this content name, for receiving corresponding data and sending it to this recipient who enters this AR2.
2. the method for claim 1, is characterized in that adopting the stratification naming mechanism of CCN to set up this signaling message.
3. method as claimed in claim 2, is characterized in that the name format of this signaling message is :/AR/handover-receiver/content; Wherein, AR is target couple in router, and handover-receiver represents that this message is the handoff procedure for certain recipient, and content is the name that needs the content of intermediate router processing.
4. the method as described in claim 1 or 2 or 3, is characterized in that being provided with in this signaling message the flag bit of a 1bit, and when certain intermediate router is defined as after described branch node, this flag bit is set to 1; Described intermediate router detects the flag bit in this signaling message, if its value is 1, no longer carries out the contrast of interface, directly sets up PIT entry corresponding to this content name, and next-hop interface is pointed to target couple in router AR2.
5. the method as described in claim 1 or 2 or 3, is characterized in that comprising a timer in this signaling message, and the intermediate router in this inverse path, after receiving this signaling message, is tied to this timer by the FIB of adjustment or PIT state; If this timer expiry, but when this intermediate router is not received data that this content name is corresponding or this content name corresponding requests, the FIB of this adjustment or PIT state are deleted.
6. a distributed mobility data transmission method of CCN, wherein mobile person is publisher, the steps include:
1), when publisher moves to the overlapping region of AR1 and another couple in router AR2 from current couple in router AR1, this recipient sends a switching initialization message HI who comprises this AR2 identification information to this couple in router AR1;
2), when this AR1 receives this HI message, from the request list PIT of oneself, search content name corresponding to this publisher, and construct a signaling message by the sign of this content name and this AR2; The content name that described signaling message comprises target couple in router, switches corresponding publisher, needs intermediate router to process; And this AR1 deletes forwarding information table FIB corresponding to this content name;
3) this AR1 sends this signaling message along the inverse path of request list PIT entry corresponding to this content name, in the forwarding information table FIB of intermediate router judgement oneself, whether the interface of request list PIT entry corresponding to the interface of AR2 and this content name is identical, if identical, this intermediate router is deleted forwarding information table FIB corresponding to this content name, and continues to forward this signaling message; If different, this intermediate router is the branch node that switch in this publisher path, and forwarding information required list corresponding to this content name in own Forward-reques information table FIB pointed to this AR2, then PIT replicate entries corresponding to this content name forwarded to this signaling message to this signaling message continuation;
4) intermediate router from this branch node to this AR2 is set up PIT entry corresponding to this content name and FIB entry, for receiving corresponding data and request, and sends the data to corresponding recipient, request is sent to this publisher who enters this AR2.
7. method as claimed in claim 6, is characterized in that adopting the stratification naming mechanism of CCN to set up this signaling message.
8. method as claimed in claim 7, is characterized in that the name format of this signaling message is :/AR/handover-publisher/content; Wherein, AR is target couple in router, and handover-publisher represents that this message is the handoff procedure for certain issue, and content is the name that needs the content of intermediate router processing.
9. the method as described in claim 6 or 7 or 8, is characterized in that being provided with in this signaling message the flag bit of a 1bit, and when certain intermediate router is defined as after described branch node, this flag bit is set to 1; Described intermediate router detects the flag bit in this signaling message, if its value is 1, no longer carry out the contrast of interface, directly set up PIT entry corresponding to this content name and FIB entry, and next-hop interface is pointed to respectively to interface and the target couple in router AR2 that receives this signaling message.
10. the method as described in claim 6 or 7 or 8, is characterized in that comprising a timer in this signaling message, and the intermediate router in this inverse path, after receiving this signaling message, is tied to this timer by the FIB of adjustment or PIT state; If this timer expiry, but when this intermediate router is not received data that this content name is corresponding or request corresponding to this content name, the FIB of this adjustment or PIT state are deleted.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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